Hi, V5
planar shapes, I am unable to get a line to go tangent from the circle at A to the corner at B.
Instead it ends up perp to the line heading north east from B.
Using the ‘Line tangent from curve’ command.
the route I took was I chose line tool in toolbar, get the toolset to appear then choose line tangent from curve option.
click the circle near A then click the corner at B and instead it goes perp to the line B is on.
I had this on another shape prior to this one, ended up taking it beyond the destination point and matching it visually !
each time everything was planar, and each time it was on my laptop, and I can replicate it on desktop.
Helvetosaur,
Hi, I was going by the way it is worded,…line tangent from curve, I want it tangent from the circle, so started at the circle.
I now click on corner at B, then find it wont even bring the line out across th A, just runs up and down line at B !
I am sure in the past I have started at circle for such occasions. how odd I got away with until now.
The fact that its not heading to A though is I bet puzzling for beginners.
You say use Tan Osnap to snap it to the circle at A, so whilst command would seem to know it is about tan, it needs an extra help.
with Tan osnap ticked, its still refusing to come away from the line heading north east from B. just keeps running up and down there.
[quote=“davidcockey, post:3, topic:29544”]
It also works for me by selecting the “Line tangent from curve” icon (not the Line tangent and perpendicular to curves" icon)[/quote]
thats the tool I am suing and was using before posting this.
Line tangent from curve, I read that literally, so one picks the curve it is to be tangent from. Normally works that way for me, pick the curve then pick the destination point. this time not happening though.
Hi,
replicating those settings, still fails, see jing video below (hope this works !)
it works on the corners to be seen further left of corner B, but refuses to go to corner B.
Jing Video here:-…can someone tell me if this works, what you see at top of screen etc, when I view others I see Jing white on black ground nothing else at screen top, when I view this myself, I see my user name login details, an option to logout etc, even if I was not logged in !
Hi, glad video played.
What you see is me approach the corner then the line wizzes off as seen at the position you see my cursor, the wider cross hairs see the small target box within dissapear, that target box always moves independent of the crosshairs when it gets to a snap. , and I then can move the cursor fully to the corner but the line still remains where it whizzed off to !
With all your settings, just end osnap on, and osnap highlighted , this is how it is for me.
here it is with cursor moved to over the exact corner, makes no difference, it shoots off before it gets there, note also it go perp to that line as well as the far line, yet take to other parts of the corner.
Hopeless, cant get this tool to work on that corner. Two different PCs do the same thing. like wading through molasses.
Looking at your vid, do you see that initial jump to where my line jumps to, now mine persists whilst yours second time goes to the corner, for it even to do that incorrect jump though tells me all is not well with this tool !!!
certainly my first video shows when I try for the far straight line it also jumps to perp on that line.
and in this vid, note the times it works, on some lengths of line and some corners, why is it so on and off regards functionality ? I also try the suggested click on B first, that fails as well.
Finally, I think Steve is correct in this case, it should work… without the Point option in Line being needed. You can see that it snaps elsewhere to other end points of segments on the curve, just not the one he wants.
I can see no reason why this shouldn’t actually work. And the next version of Rhino doesn’t seem to have fixed it either… @pascal one to log for checking?
Yep, I had the same thought - I sent Mikko an email this morning asking about this one.
Here is Mikko’s comment:
"It’s normal behavior. Since osnapping cannot change the first point of the line, all tan-perp combos are done in the command itself. Line Tangent does both tan and perp combos since they usually don’t interfere with each other, and this way no explicit command option is needed.
Similarily Line Perp will find lines perp to first curve and tan or perp to second curve."
Edit: @Helvetosaur, @davidcockey, @Steve1 - Mikko’s looking into allowing the osnaps to work better within Line >Tangent and not be overridden by that freebie Perp snap.
[quote=“pascal, post:14, topic:29544, full:true”]
Yep, I had the same thought - I sent Mikko an email this morning asking about this one.
Here is Mikko’s comment:
"It’s normal behavior. Since osnapping cannot change the first point of the line, all tan-perp combos are done in the command itself. Line Tangent does both tan and perp combos since they usually don’t interfere with each other, and this way no explicit command option is needed.
Similarily Line Perp will find lines perp to first curve and tan or perp to second curve."
-Pascal
[/quote]Interesting response. There appears to be an implicit assumption that when the option is selected to make the beginning of a line tangent or perpendicular to a curve then end of the line will also be desired to be tangent or perpendicular to the another or the same curve. Not obvious to me why that assumption would be made.
in my video line tan curve fail 3, at
00:32 and 00:48 it will allow the line to go non perp to the lines, but in other segments it makes it perp.
As the command I chose is line TAN from curve, why is there any assumption that perp is required anywhere in the proces by V5 ? Its what is happening as david says, in places anyway, not not allways.
This command, if this is correct behaviour, and McNeel happy to let it carry on as such, needs some options offered to us, for picking the second pick., so as to circumvent this time hog of an error, as the user will not be familiar with workarounds, believing in what is on offer in the options is enough to get the command done.
Pascal says:-
use the Point command line option to force the second pick not worry about any tangent/perp relationships and just find a point (End osnap)
I hope I remember that every time I hit this issue, until such time as a bug fix is added to this tool.
so it continues
How can it be that it does that for me and Helvetosaur, yet not for David, (though there was a moment I thought it was to do so) ?
As I said in my first post, just do it “backwards”. Start the line from the point or wherever and finish tangent to the circle. Needs no extra input, as long as Tan osnap is active.
[quote=“Helvetosaur, post:18, topic:29544”]
Start the line from the point or wherever and finish tangent to the circle. Needs no extra input, as long as Tan osnap is active.
[/quote] I tried that, it didnt work, see vid.
Eddi, cheers, I will set that up , wow dead easy and it works. a must have in V6.
Just wondering…how do I copy across to a second PC such tweaks if I have made many as such on one PC.
for the mo, I will do the same edit on the 2nd pc.
It would be good to see that included in V6…pleeeeeeeese
Is Rhino allowed to see how other CAD progs do it and copy method ? Make sure its up there with the pack ?
